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<div id="dev-warning" class="admonition note">
  <p class="first admonition-title">Notice</p>
  <p class="last">This document is for a development version of Ceph.</p>
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  <section id="mds-service">
<h1>MDS Service<a class="headerlink" href="#mds-service" title="Permalink to this heading"></a></h1>
<section id="deploy-cephfs">
<span id="orchestrator-cli-cephfs"></span><h2>Deploy CephFS<a class="headerlink" href="#deploy-cephfs" title="Permalink to this heading"></a></h2>
<p>One or more MDS daemons is required to use the <a class="reference internal" href="../../../glossary/#term-CephFS"><span class="xref std std-term">CephFS</span></a> file system.
These are created automatically if the newer <code class="docutils literal notranslate"><span class="pre">ceph</span> <span class="pre">fs</span> <span class="pre">volume</span></code>
interface is used to create a new file system. For more information,
see <a class="reference internal" href="../../../cephfs/fs-volumes/#fs-volumes-and-subvolumes"><span class="std std-ref">FS 卷和子卷</span></a>.</p>
<p>For example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><style type="text/css">
span.prompt1:before {
  content: "# ";
}
</style><span class="prompt1">ceph<span class="w"> </span>fs<span class="w"> </span>volume<span class="w"> </span>create<span class="w"> </span>&lt;fs_name&gt;<span class="w"> </span>--placement<span class="o">=</span><span class="s2">&quot;&lt;placement spec&gt;&quot;</span></span>
</pre></div></div><p>where <code class="docutils literal notranslate"><span class="pre">fs_name</span></code> is the name of the CephFS and <code class="docutils literal notranslate"><span class="pre">placement</span></code> is a
<a class="reference internal" href="../#orchestrator-cli-placement-spec"><span class="std std-ref">Daemon Placement</span></a>. For example, to place
MDS daemons for the new <code class="docutils literal notranslate"><span class="pre">foo</span></code> volume on hosts labeled with <code class="docutils literal notranslate"><span class="pre">mds</span></code>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span class="prompt1">ceph<span class="w"> </span>fs<span class="w"> </span>volume<span class="w"> </span>create<span class="w"> </span>foo<span class="w"> </span>--placement<span class="o">=</span><span class="s2">&quot;label:mds&quot;</span></span>
</pre></div></div><p>You can also update the placement after-the-fact via:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span class="prompt1">ceph<span class="w"> </span>orch<span class="w"> </span>apply<span class="w"> </span>mds<span class="w"> </span>foo<span class="w"> </span><span class="s1">&#39;mds-[012]&#39;</span></span>
</pre></div></div><p>For manually deploying MDS daemons, use this specification:</p>
<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">service_type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mds</span>
<span class="nt">service_id</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">fs_name</span>
<span class="nt">placement</span><span class="p">:</span>
<span class="w">  </span><span class="nt">count</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">3</span>
<span class="w">  </span><span class="nt">label</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mds</span>
</pre></div>
</div>
<p>The specification can then be applied using:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span class="prompt1">ceph<span class="w"> </span>orch<span class="w"> </span>apply<span class="w"> </span>-i<span class="w"> </span>mds.yaml</span>
</pre></div></div><p>See <a class="reference internal" href="../../../mgr/orchestrator/#orchestrator-cli-stateless-services"><span class="std std-ref">Stateless services (MDS/RGW/NFS/rbd-mirror/iSCSI)</span></a> for manually deploying
MDS daemons on the CLI.</p>
</section>
<section id="further-reading">
<h2>Further Reading<a class="headerlink" href="#further-reading" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p><a class="reference internal" href="../../../cephfs/#ceph-file-system"><span class="std std-ref">Ceph 文件系统</span></a></p></li>
</ul>
</section>
</section>



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  <p class="first admonition-title">Brought to you by the Ceph Foundation</p>
  <p class="last">The Ceph Documentation is a community resource funded and hosted by the non-profit <a href="https://ceph.io/en/foundation/">Ceph Foundation</a>. If you would like to support this and our other efforts, please consider <a href="https://ceph.io/en/foundation/join/">joining now</a>.</p>
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